<template>
  <div>
    <label v-for="(item, index) in arr" :key="index">
      <input type="checkbox" name="" id="" v-model="num" :value="item" />
      <span>{{ item }}</span>
    </label>
    <p>你选中的元素,累加的值和为:{{ sum }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      num: [],
    };
  },
  computed: {
    sum() {
      return this.num.reduce((prev, item) => prev + item, 0);
    },
  },
};
</script>

<style>
div {
  font-size: 25px;
}
label {
  margin-right: 20px;
}
</style>